Apparently, the IRS does not yet believe that you are who you say you are. Either they were unable to verify your identity, or you e-filed and they received another return with your name/SSN on it in the mail and that of course, has raised flags. Follow the instructions in the letter *EXACTLY* to verify your identity with the IRS. Until you do that, your return is on hold and you will NOT get any refund you may be due.